#include <stdio.h>
#include <string.h>
#include <math.h>// 定义学生结构体
struct Student {char id[20]; // 学号char className[20]; // 班级char name[20]; // 姓名int startHour; // 上机开始时间(小时)int startMinute; // 上机开始时间(分钟)int endHour; // 下机时间(小时)int endMinute; // 下机时间(分钟)int isOnline; // 是否在线double cost; // 费用
};// 全局变量
struct Student students[30];
int studentCount = 0;
const int MAX_STUDENTS = 30;// 函数声明
void inputStudent();
void calculateCost(int index);
void searchStudent();
void displayComputerStatus();
double calculateTimeDifference(int startH, int startM, int endH, int endM);
void showMenu();
void saveToFile();
void loadFromFile();
void saveStudentInfo(const char* filename);
void loadStudentInfo(const char* filename);
void saveComputerLog(const char* filename);
void loadComputerLog(const char* filename);
void initializeDefaultStudents();// 定义文件名常量
#define STUDENT_FILE "student_info.txt"
#define COMPUTER_LOG "computer_log.txt"int main() {loadFromFile(); // 程序启动时加载数据int choice;while (1) {showMenu();printf("请输入您的选择: ");scanf("%d", &choice);switch (choice) {case 1:inputStudent();saveToFile(); // 添加学生后保存break;case 2: {int index;printf("请输入要结算的学生序号(0-%d): ", studentCount-1);scanf("%d", &index);calculateCost(index);saveToFile(); // 计算费用后保存break;}case 3:searchStudent();break;case 4:displayComputerStatus();break;case 0:saveToFile(); // 退出前保存printf("程序已退出！\n");return 0;default:printf("无效选择，请重试！\n");}}return 0;
}void showMenu() {printf("\n====== 机房收费管理系统 ======\n");printf("1. 输入学生信息\n");printf("2. 计算上机费用\n");printf("3. 查询学生信息\n");printf("4. 显示机器使用情况\n");printf("0. 退出系统\n");printf("===========================\n");
}void inputStudent() {if (studentCount >= MAX_STUDENTS) {printf("已达到最大学生数量！\n");return;}printf("请输入学生信息：\n");printf("学号: ");scanf("%s", students[studentCount].id);printf("班级: ");scanf("%s", students[studentCount].className);printf("姓名: ");scanf("%s", students[studentCount].name);printf("上机时间(时 分): ");scanf("%d %d", &students[studentCount].startHour, &students[studentCount].startMinute);students[studentCount].isOnline = 1;students[studentCount].cost = 0;studentCount++;printf("学生信息录入成功！\n");
}void calculateCost(int index) {if (index < 0 || index >= studentCount) {printf("无效的学生序号！\n");return;}if (!students[index].isOnline) {printf("该学生已经下机！\n");return;}printf("请输入下机时间(时 分): ");scanf("%d %d", &students[index].endHour, &students[index].endMinute);double hours = calculateTimeDifference(students[index].startHour,students[index].startMinute,students[index].endHour,students[index].endMinute);students[index].cost = ceil(hours) * 1.0;students[index].isOnline = 0;printf("费用计算完成！\n");printf("学生: %s\n", students[index].name);printf("上机时间: %.2f小时\n", hours);printf("费用: %.2f元\n", students[index].cost);
}double calculateTimeDifference(int startH, int startM, int endH, int endM) {int totalMinutes = (endH * 60 + endM) - (startH * 60 + startM);return totalMinutes / 60.0;
}void searchStudent() {printf("\n查询方式：\n");printf("1. 按班级查询\n");printf("2. 按学号查询\n");printf("3. 按姓名查询\n");int choice;char searchTerm[20];printf("请选择查询方式: ");scanf("%d", &choice);printf("请输入查询关键字: ");scanf("%s", searchTerm);printf("\n查询结果：\n");printf("%-10s%-10s%-10s%-15s%-15s\n", "学号", "班级", "姓名", "状态", "上机时间");for (int i = 0; i < studentCount; i++) {int match = 0;switch (choice) {case 1:match = (strcmp(students[i].className, searchTerm) == 0);break;case 2:match = (strcmp(students[i].id, searchTerm) == 0);break;case 3:match = (strcmp(students[i].name, searchTerm) == 0);break;}if (match) {printf("%-10s%-10s%-10s%-15s%02d:%02d\n",students[i].id,students[i].className,students[i].name,students[i].isOnline ? "在线" : "已下机",students[i].startHour,students[i].startMinute);}}
}void displayComputerStatus() {int online = 0;int offline = 0;for (int i = 0; i < studentCount; i++) {if (students[i].isOnline) {online++;} else {offline++;}}printf("\n机器使用情况统计：\n");printf("总学生数：%d\n", studentCount);printf("当前在线：%d\n", online);printf("已经下机：%d\n", offline);printf("\n使用情况图示：\n");printf("在线学生: ");for (int i = 0; i < online; i++) {printf("█");}printf(" (%d)\n", online);printf("离线学生: ");for (int i = 0; i < offline; i++) {printf("█");}printf(" (%d)\n", offline);
}// 添加保存到文件的函数
void saveToFile() {// 保存学生基本信息saveStudentInfo(STUDENT_FILE);// 保存上机记录saveComputerLog(COMPUTER_LOG);
}// 添加从文件加载的函数
void loadFromFile() {FILE *fp = fopen(STUDENT_FILE, "r");if (fp == NULL) {printf("首次运行，初始化30名学生信息...\n");initializeDefaultStudents();saveToFile(); // 保存初始化的数据return;}fclose(fp);// 加载学生基本信息loadStudentInfo(STUDENT_FILE);// 加载上机记录loadComputerLog(COMPUTER_LOG);
}// 保存学生基本信息（文本格式）
void saveStudentInfo(const char* filename) {FILE *fp = fopen(filename, "w");if (fp == NULL) {printf("无法打开文件 %s！\n", filename);return;}fprintf(fp, "学生总数: %d\n", studentCount);fprintf(fp, "学号\t班级\t姓名\t状态\t费用\n");for (int i = 0; i < studentCount; i++) {fprintf(fp, "%s\t%s\t%s\t%s\t%.2f\n",students[i].id,students[i].className,students[i].name,students[i].isOnline ? "在线" : "离线",students[i].cost);}fclose(fp);printf("学生基本信息已保存到 %s\n", filename);
}// 加载学生基本信息（文本格式）
void loadStudentInfo(const char* filename) {FILE *fp = fopen(filename, "r");if (fp == NULL) {printf("未找到文件 %s，将创建新文件。\n", filename);return;}char line[256];// 跳过前两行（标题行）fgets(line, sizeof(line), fp);fgets(line, sizeof(line), fp);studentCount = 0;while (fscanf(fp, "%s\t%s\t%s\t%s\t%lf\n",students[studentCount].id,students[studentCount].className,students[studentCount].name,line, // 临时存储状态&students[studentCount].cost) == 5) {students[studentCount].isOnline = (strcmp(line, "在线") == 0);studentCount++;if (studentCount >= MAX_STUDENTS) break;}fclose(fp);printf("已从 %s 加载 %d 条学生记录\n", filename, studentCount);
}// 保存上机记录（文本格式）
void saveComputerLog(const char* filename) {FILE *fp = fopen(filename, "w");if (fp == NULL) {printf("无法打开文件 %s！\n", filename);return;}fprintf(fp, "上机记录\n");fprintf(fp, "学号\t开始时间\t结束时间\t费用\n");for (int i = 0; i < studentCount; i++) {fprintf(fp, "%s\t%02d:%02d\t", students[i].id,students[i].startHour,students[i].startMinute);if (!students[i].isOnline) {fprintf(fp, "%02d:%02d\t%.2f\n",students[i].endHour,students[i].endMinute,students[i].cost);} else {fprintf(fp, "在线中\t0.00\n");}}fclose(fp);printf("上机记录已保存到 %s\n", filename);
}// 加载上机记录（文本格式）
void loadComputerLog(const char* filename) {FILE *fp = fopen(filename, "r");if (fp == NULL) {printf("未找到文件 %s，将创建新文件。\n", filename);return;}char line[256];// 跳过前两行（标题行）fgets(line, sizeof(line), fp);fgets(line, sizeof(line), fp);for (int i = 0; i < studentCount; i++) {char status[20];fscanf(fp, "%*s\t%d:%d\t%s",&students[i].startHour,&students[i].startMinute,status);if (strcmp(status, "在线中") == 0) {students[i].isOnline = 1;fscanf(fp, "%*f\n");} else {students[i].isOnline = 0;fscanf(fp, "%d:%d\t%lf\n",&students[i].endHour,&students[i].endMinute,&students[i].cost);}}fclose(fp);printf("已从 %s 加载上机记录\n", filename);
}// 添加初始化学生信息的函数
void initializeDefaultStudents() {// 预设的班级列表const char* classes[] = {"计算机1班", "计算机2班", "软件1班", "软件2班", "网络1班"};studentCount = 30; // 设置为30名学生for (int i = 0; i < studentCount; i++) {// 生成学号 (例如: 2024001, 2024002, ...)sprintf(students[i].id, "2024%03d", i + 1);// 分配班级 (循环使用预设的班级)strcpy(students[i].className, classes[i % 5]);// 生成姓名 (例如: 学生1, 学生2, ...)sprintf(students[i].name, "学生%d", i + 1);// 设置上机时间 (8:00 到 17:00 之间随机分配)students[i].startHour = 8 + (i % 10); // 8:00 到 17:00students[i].startMinute = (i * 2) % 60; // 0到58的偶数分钟// 初始状态都设为在线students[i].isOnline = 1;students[i].cost = 0.0;}printf("已初始化30名学生信息。\n");// 显示初始化的学生信息printf("\n初始化的学生信息如下：\n");printf("%-10s%-15s%-10s%-15s\n", "学号", "班级", "姓名", "上机时间");printf("----------------------------------------\n");for (int i = 0; i < studentCount; i++) {printf("%-10s%-15s%-10s%02d:%02d\n",students[i].id,students[i].className,students[i].name,students[i].startHour,students[i].startMinute);}printf("----------------------------------------\n");
}
